SUMMARY ORDER
Defendant Kyu Sung Cho appeals from an award of summary judgment in favor of plaintiff Michael Kimm on Kimm’s state-law breach-of-contract and account-stated claims arising from Kimm’s 14-month defense of Cho and his corporation in New Jersey litigation. The parties principally dispute both the validity of the contract at issue, an unsigned April 2012 retainer agreement (the “Agreement”), and whether Cho timely objected to billing statements. 1 We assume the parties’ familiarity with the facts and record of prior proceedings, which we reference only as necessary to explain our decision to affirm in part and vacate in part.
1. Summary Judgment
We review de novo an award of summary judgment, and in so doing, we “construe the facts in the light most favorable to the non-moving party and ... resolve all ambiguities and draw all reasonable inferences against the movant,” Walsh v, N.Y.C. Housing Auth., 828 F.3d 70, 74 (2d Cir. 2016) (internal quotation marks omitted).
a. Contract Validity
Although unsigned, the Agreement at issue may be enforceable where objective evidence establishes the parties’ agreement to, and intent to be bound by, its terms. See, e.g., Flores v. Lower E. Side Serv. Ctr., Inc., 4 N.Y.3d 363, 368-69, 795 N.Y.S.2d 491, 496-96, 828 N.E.2d 593 (2005); Weichert Co. Realtors v. Ryan, 128 N.J. 427, 435, 608 A.2d 280, 284 (1992). 2 Partial performance by one party and the acceptance of such performance by another can satisfy this requirement. See R.G. Grp., Inc. v. Horn & Hardart Co., 751 F.2d 69, 75-76 (2d Cir. 1984) (“[Pjartial performance is an unmistakable signal that one party believes there is a contract; and the party who accepts performance signals, by that act, that it also understands a contract to be in effect.”). That is the case here.
In February 2012, Cho and Dongbu were named as defendants in a federal action in New Jersey. Cho solicited Kimm’s representation in that matter. On April 3, 2012, and again on April 6, 2012, Kimm sent Cho the challenged Agreement, which Cho received. The Agreement states, inter alia, that Cho and Dongbu would pay Kimm a $3,000 monthly retainer fee for general counsel services and, “[smarting April 10, 2012 ... [a] rolling monthly payment of US $10,000.00” to be applied against litigation fees, which would *3 be “discounted ... equal to 70 percent of billed statements, as and when billed from time to time” or “periodically, as events warrant.” J.A. 221-22. Kimm represented Oho and Dongbu in the New Jersey action until November 2013, Oho paid Kimm $133,000, Like the district court, we conclude that such conduct manifests the parties’ consent to the Agreement and their intent to be bound by its terms.
In urging otherwise, Oho does not dispute that he retained Kimm and agreed to make monthly payments of $3,000 and $10,000. Nevertheless, he submits that he did not agree to make unspecified larger payments. Cho points to no evidence that affirmatively shows the parties’ agreement to Kimm providing representation at a maximum monthly rate of $13,000, Instead, he argues that evidence inconsistent with the Agreement raises factual issues as to the parties’ agreement and intent, precluding summary judgment. We are not persuaded.
First, Cho argues that Kimm’s failure to provide any statements showing litigation fees in excess of $10,000 per month until July 2013 undermines an inference of agreement to pay such fees. Even assuming that the five record invoices dated June 30, 2012, September 30, 2012, December 31, 2012, March 30, 2013, and June 30, 2013, were not sent until July of 2013, such conduct raises an issue of contract performance, not formation. In short, did Kimm’s delay breach his obligation to send hourly fee bills “from time to time,” or “periodically, as events warrant”? J.A. 221-22. Delayed billing in July 2013 would not, however, admit an inference that the parties reached a retainer agreement on payment terms other than those in the Agreement that was being substantially performed.
Second, Cho contends that Kimm’s failure to mention billing statements in his correspondence with Cho, instead addressing only the monthly fees, is further evidence that the parties never agreed to more than the latter. See, e.g., J.A. 2016 (“Our monthly agreement is a tight budget. We received only a partial $5k check last month.”); id. at 2019 (“Any chance of getting paid this month? We are still doing a lot of work.”). In fact, Kimm’s communication's were not so limited. An October 22, 2012 email from Kimm to Cho observing that Kimm had “not received a case fee check for September] and ha[d] not received any check for this month,” expressly advised that the firm was “doing much more work than the monthly rolling retainer.” Id. at 2016 (emphasis added). Thus, Kimm’s correspondence does not support Cho’s claim that the parties agreed to payment only of the stated monthly fee for litigation services.
In sum, Kimm’s partial performance under the Agreement and Cho’s acceptance of that performance demonstrates the parties’ acceptance of the Agreement and intent to be bound by its terms. 3 Cho has failed to adduce any evidence supporting an inference that he agreed to pay only the stated monthly fees for litigation services or that Kimm provided services with that understanding. Accordingly, like the district court, we conclude that the record establishes that the Agreement at issue is binding.
*4 b. Breach of Contract
Under New York law, attorneys suing for the breach of retainer agreements must prove, in addition to breach and damages, that the agreement was “fair, reasonable, and fully known and understood by” the client. Albunio v. City of New York, 23 N.Y.3d 65, 71, 989 N.Y.S.2d 1, 4, 11 N.E.3d 1104 (2014) (internal quotation marks omitted). Cho does not specifically challenge the district court’s determination that the Agreement here was fail-, reasonable, and understood. Thus, there is no triable issue of fact.
As the district court observed, the Agreement is only three pages long, sets forth unambiguous terms in plain language, and specifies hourly rates consistent with those prevailing in the jurisdiction. See Simmons v. N.Y.C. Transit Auth., 575 F.3d 170, 175-76 (2d Cir. 2009) (stating that district courts should ordinarily use in-district hourly rates in calculating reasonable attorney’s fees). Cho adduced no evidence that would permit a reasonable jury to conclude that, as the CEO of a corporation that had retained corporate counsel and was previously involved in litigation, he lacked understanding of the Agreement’s terms. Further, Cho offers no evidence that he ever objected to the litigation fee provision at issue. His single objection was to certain amounts billed under that provision.
Accordingly, we affirm the district court’s award of summary judgment to Kimm on the breach-of-contract claim.
c. Account-Stated Claim.
An attorney or law firm may recover on a claim of account stated where there is “proof that a bill, even if unitemized, was issued to a client and held by the client without objection for an unreasonable period of time.” Whiteman, Osterman & Hanna, LLP v. Oppitz, 105 A.D.3d 1162, 1163, 963 N.Y.S.2d 432, 434 (3d Dep’t 2013) (internal quotation marks omitted). To defeat summary judgment, a defendant-client must show that it made “specific, as opposed to general, allegations of protest.” Levine v. Harriton & Furrer, LLP, 92 A.D.3d 1176, 1179, 940 N.Y.S.2d 334, 338-39 (3d Dep’t 2012) (internal quotation marks omitted). Nevertheless, whether a client’s delay in disputing fees is sufficient for an attorney to infer assent “becomes a question of law only in those cases where only one inference is rationally possible.” Landau v. Weissman, 78 A.D.3d 661, 662, 913 N.Y.S.2d 107, 107 (2d Dep’t 2010) (internal quotation marks omitted).
Assuming that billing statements were provided to Cho for the first time in July 2013, Cho’s timely objection is evidenced by Kimm’s July 23, 2013 email acknowledging “complex” disputes. J.A. 2024. This precludes summary judgment. The fact that Kimm appears to have responded by deleting or trimming certain billings and that Cho did not protest further warrants no different conclusion. Kimm points us to no controlling authority suggesting that such a scenario can support an inference of assent. Indeed, such authority that exists is to the contrary. See Navimex S.A. De C.V. v. S/S N. Ice, 617 F.Supp, 103, 106 (S.D.N.Y. 1984) (concluding that a supplementary statement of account “did not constitute an account stated” because defendants’ objection to plaintiffs’ previous statement of account evidenced “an underlying dispute between the parties” that “preclud[ed] a finding of consent”); accord United Capital Funding Corp. v. N.Y.C. Dep’t of Educ., 457 Fed. Appx. 53, 56 (2d Cir. 2012); DiMare Homestead, Inc. v. Alphas Co. of N.Y., *5 No. 09 CIV. 6644 PKC, 2012 WL 1155133, at *23 (S.D.N.Y. Apr. 5, 2012).
Accordingly, we vacate the district court’s award of summary judgment to Kimm on the account-stated claim.
2. Sanctions
Kimm cross-appeals the denial of his Fed. R. Civ. P. 11 sanctions motion. We identify no abuse of discretion in that denial. See Ipcon Collections LLC v. Costco Wholesale Corp., 698 F.3d 58, 63 (2d Cir. 2012) (stating that denial of Rule 11 sanctions is reviewed for abuse of discretion); Caisse Nationale de Credit Agricole-CNCA, N.Y. Branch v. Valcorp, Inc., 28 F.3d 259, 264-65 (2d Cir. 1994) (stating, in context of Rule 11, that abuse of discretion will not be found unless district court based ruling on erroneous view of law or clearly erroneous assessment of evidence).
3. Conclusion
We have reviewed the parties’ remaining arguments, including Kimm’s April 27, 2017 motion to strike, and conclude that they are without merit. Accordingly, that motion is denied; the March 31, 2016 judgment of the district court is AFFIRMED in part and VACATED in part; and the case is REMANDED for further proceedings consistent with this order.
. Cho does not appeal the district court's denial of his motion to dismiss for failure to join his company Dongbu Tour & Travel, Inc, ("Dongbu”) pursuant to Fed. R. Civ. P. 19 and failure to provide pre-action notice pursuant to New Jersey law.
. Like the district court, we conclude that New York and New Jersey law are materially identical as to the enforceability of unsigned contracts, Thus, we need not choose between them in determining the validity of the Agreement—which contains a choice-of-law provision providing for the application of New York substantive law.
. No different conclusion is warranted by Kimm’s inclusion of a New Jersey fee arbitration notice in the formal payment demand, which Cho cites as a further deviation from the Agreement. The Agreement provides only that it be construed under New York substantive law; it does not specify a forum. Thus, this action also cannot admit an inference of some different agreement.